Dream is no dream to the dreamer. Only by one who is awake, dream is known to be a dream. Similarly, waking appears to be real to one who is still in the waking state.
Profound wisdom comes through reflection on dreams. No one has known himself truly who has not studied his dreams. The study of dreams shows how mysterious is our soul. Dreams reveal to us that aspect of our nature, which transcends rational knowledge. Every dream presentation has a meaning. A dream is like a letter written in an unknown language. Many riddles of life are solved through hints from dreams. Dreams indicate which way the spiritual life of a man is flowing. One may receive proper advice for self-correction through dreams. One may know how to act in a particular situation through dreams. The dreams point out a path unknown to the waking consciousness. Saints and sages appear in dreams during times of difficulty and point out the way. The Vedantins study very deeply and carefully the states of dreams and deep sleep and logically prove that the waking state is as unreal as the dream state. They declare that the only difference between the two states is that the waking state is a long dream, Deergha Svapna. v So long as the dreamer dreams, dream-objects are real. When he wakes up the dream world becomes false. When one attains illumination or knowledge of Brahman, this wakeful world becomes as unreal as the dream world. The real truth is that nobody sleeps, dreams or wakes up, because there is no reality in these states.